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Influential aspects on seismic performance of confined masonry construction

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Natural Science 2013年第8期5卷 56-62页

作者： ajay chourasia Sriman K. Bhattacharyya Pradeep K. Bhargava Navratan M. Bhandari CSIR-Central Building Research Institute Roorkee India Department of Civil Engineering Indian Institute of Technology Roorkee Roorkee India

Recent earthquakes around the world have resulted in loss of human lives and high economic losses due to poor performance of unreinforced masonry constructions as well as poorly-built reinforced concrete framed buildings. This has necessitated alternative building technologies with improved seismic performance. Confined masonry (CM) construction, has shown excellent behavior during past earthquakes across the world and requires similar skill at a marginally higher cost than that of unreinforced masonry. This paper summarizes the main features of generic construction and gains insight into the behavior of CM elements under earthquake excitations, representing a viable alternative for safe and economical construction in seismic areas.?The paper discusses various influential aspects like sequence of construction, properties and type of masonry material, structural configuration, reinforcement detailing in tie column/beam and masonry, panel aspect ratio, interface between concrete and masonry, axial stress, multiple confining column, opening in wall panels and damage pattern etc. along with solution to overcome the limitations.

关键词： Confined Masonry Reinforcement Detailing Panel Aspect Ratio Masonry Interface Multiple Confining Column Damage Pattern

Convergence of COVID-19 and recurrent stroke:In-hospital mortality risks explored

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World Journal of Virology 2025年第1期14卷 5-8页

作者： Basavraj S Nagoba Shree V Dhotre ajay M Gavkare Sachin S Mumbre Pradnya S Dhotre Department of Microbiology Maharashtra Institute of Medical Sciences and Research(Medical College)Latur 413531India Department of Microbiology Ashwini Rural Medical CollegeSolapur 413001India Department of Community Medicine Ashwini Rural Medical CollegeSolapur 413001India Department of Biochemistry Ashwini Rural Medical CollegeSolapur 413001India

This editorial comments on the article by Desai et al,which investigates the impact of coronavirus disease 2019(COVID-19)on in-hospital mortality among patients with recurrent stroke using data from the 2020 National Inpatient *** findings reveal significantly higher mortality rates in COVID-19-positive patients compared to non-COVID-19 patients,particularly among middle-aged individuals,males,and ethnic *** editorial explores the underlying mechanisms contributing to these outcomes and discusses the clinical implications for targeted management strategies in high-risk *** results emphasize the need for comprehensive approaches to mitigate the heightened risks faced by recurrent stroke patients during the COVID-19 pandemic.

关键词： Recurrent stroke COVID-19 In-hospital mortality Nationwide analysis Stroke admissions Infectious diseases Chronic health conditions Hypercoagulability

A comprehensive review of the effect of different kinetic promoters on methane hydrate formation

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Chinese Journal of Chemical Engineering 2021年第4期34卷 1-16页

作者： Ekta Chaturvedi Sukumar Laik ajay Mandal Gas Hydrates Laboratory Petroleum Engineering DepartmentIndian Institute of Technology(ISM)DhanbadIndia

Gas hydrates have recently emerged as a better alternative for the production,storage,and transportation of natural ***,factors like slow formation rate and limited storage capacity obstruct the possible industrial application of this *** types of promoters and synergists have been developed that can improve the kinetics and storage capacity of gas *** review focuses on different kinetic promoters and synergists that can be utilized to enhance the storage capacity of *** main characteristics,structure and the possible limitations of the use of these promoters are likewise portrayed in *** relationship between structure and storage capacity of hydrates have also been discussed in the *** status of production of gas from hydrates,their restrictions,and future difficulties have additionally been addressed in the ensuing areas of the review.

关键词： Gas hydrates Structure Storage capacity Kinetic promoters Nano-materials Surfactants

Nonequilibrium Phase Transition in Spin-S Ising Ferromagnet Driven by Propagating and Standing Magnetic Field Wave

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Communications in Theoretical Physics 2017年第11期67卷 600-610页

作者： ajay Halder Muktish Acharyya Department of Physics Presidency University

The dynamical response of spin-S(S=1, 3/2, 2, 3) Ising ferromagnet to the plane propagating wave, standing magnetic field wave and uniformly oscillating field with constant frequency are studied separately in two dimensions by extensive Monte Carlo simulation. Depending upon the strength of the magnetic field and the value of the spin state of the Ising spin lattice two different dynamical phases are observed. For a fixed value of S and the amplitude of the propagating magnetic field wave the system undergoes a dynamical phase transition from propagating phase to pinned phase as the temperature of the system is cooled down. Similarly in case with standing magnetic wave the system undergoes dynamical phase transition from high temperature phase where spins oscillate coherently in alternate bands of half wavelength of the standing magnetic wave to the low temperature pinned or spin frozen phase. For a fixed value of the amplitude of magnetic field oscillation the transition temperature is observed to decrease to a limiting value as the value of spin S is increased. The time averaged magnetisation over a full cycle of the magnetic field oscillation plays the role of the dynamic order parameter. A comprehensive phase boundary is drawn in the plane of magnetic field amplitude and dynamic transition temperature. It is found that the phase boundary shrinks inwards for high value of spin state *** in the low temperature(and high field) region the phase boundaries are closely spaced.

关键词： Ising model dynamic phase transition Monte-Carlo algorithm propagating wave standing wave

Modeling of flow of oil-in-water emulsions through porous media

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Petroleum Science 2015年第2期12卷 273-281页

作者： ajay Mandal Achinta Bera Department of Petroleum Engineering Indian School of Mines Department of Civil & Environmental Engineering School of Mining and Petroleum EngineeringUniversity of Alberta

Formation and flow of emulsions in porous media are common in all enhanced oil recovery tech- niques. In most cases, oil-in-water （O/W） emulsions are formed in porous media due to oil-water interaction. Even now, detailed flow mechanisms of emulsions through porous media are not well understood. In this study, variation of rate of flow of O/W emulsions with pressure drop was studied experimentally, and rheological pa- rameters were calculated. The pressure drop increases with an increase in oil concentration in the O/W emulsion due to high viscosity. The effective viscosity of the emulsion was calculated from the derived model and expressed as a function of shear rate while flowing through porous media. Flow of O/W emulsions of different concentrations was evaluated in sand packs of different sand sizes. Emulsions were characterized by analyzing their stability, rheological properties, and tem- perature effects on rheological properties.

关键词： Emulsion Porous media RheologyModeling - Pressure drop

Spectroscopic investigation of light strange S=−1Λ and Σ and S=−2Ξbaryons

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Chinese Physics C 2021年第6期45卷 91-108页

作者： Chandni Menapara ajay Kumar Rai Department of Physics Sardar Vallabhbhai National Institute of TechnologySurat-395007GujaratIndia

The present study is dedicated to light-strange∧with strangeness S=−1 and isospin I=0,with S=−1 and I=1,andΞbaryon with S=−2 andI=1/*** this study,the hypercentral constituent quark model with linear confining potential has been employed along with a first order correction term to obtain the resonance masses up to approximately 4 *** calculated states include 1S-5S,1P-4P,1D-3D,1F-2F,and 1G(in a few cases)along with all possible spin-parity *** trajectories have been explored for the linearity of the calculated masses for(n,M^(2))and(J,M^(2)).Magnetic moments have been intensively studied for ground state spin 1/2 and,3/2 in addition to the configuration mixing of the first negative parity state ***,the transition magnetic moments and radiative decay widths have been presented.

关键词： mass spectra strange baryon Regge trajectory magnetic moment

Spectroscopic study of strangeness=-3Ω^(-)baryon

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Chinese Physics C 2022年第10期46卷 43-51页

作者： Chandni Menapara ajay Kumar Rai Department of Physics Sardar Vallabhbhai National Institute of TechnologySurat-395007GujaratIndia

Ω^(-)baryon with sss quarks has been investigated through many theoretical studies so far but scarcely observed in ***,an attempt has been made to explore properties of Ω with hypercentral Constituent Quark Model(hCQM)with a linear confining *** resonance mass spectra have been obtained for 1S-4S,1P-4P,1D-3D,and *** Regge trajectory has been investigated for the linear nature based on calculated data along with the magnetic *** present work has been compared with various approaches and known experimental findings.

关键词： mass spectra strange baryon Regge trajectory magnetic moment

Effect of lime on speciation of heavy metals during composting of water hyacinth

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Frontiers of Environmental Science & Engineering 2016年第1期10卷 93-102页

作者： Jiwan SINGH ajay S. KALAMDHAD Department of Civil Engineering Indian Institute of Technology Guwahati (IITG) Guwahati-781039 Assam India

Composting is attractive and inexpensive method for treatment and biomass disposal of water hyacinth. However, the major disadvantage of water hyacinth composting is the high content of heavy metals in the final compost. Addition of lime sludge significantly reduced most bioavailable fractions （exchangeable and carbonate） of heavy metals. Studies were carried on composting of water hyacinth （Eichhornia crassipes） with cattle manure and sawdust （6：3：1 ratio） and effects of addition of lime （1%, 2% and 3%） on heavy metal speciation were evaluated during 30 days of composting period. The Tessier sequential extraction method was employed to investigate the changes in speciation of heavy metals such as Zinc （Zn）, Copper （Cu）, Manganese （Mn）, Iron （Fe）, Lead （Pb）, Nickel （Ni）, Cadmium （Cd） and Chromium （Cr） during water hyacinth composting. Effects of physicochemical parameters such as temperature, pH and organic matter on speciation of heavy metals were also studied during the process. Results showed that, the total metal content was increased during the composting process. The higher reduction in bioavailability factor （BF） of Cu, Fe, Ni, Cd and Cr was observed in lime 2 treatment about 62.1%, 64.4%, 71.9%, 62.1% and 58.9% respectively; however higher reduction in BF of Zn and Pb was observed in lime 1 treatment during the composting process. Reducible and oxidizable fractions of Ni, Pb and Cd were not observed during the process. Addition of lime was very effective for reduction ofbioavailability of heavy metals during composting of water hyacinth with cattle manure and sawdust.

关键词： composting lime heavy metals bioavailabil-ity factor speciation

Dual-Core Photonic Crystal Fiber Plasmonic Refractive Index Sensor: A Numerical Analysis

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Photonic Sensors 2019年第2期9卷 151-161页

作者： Alok Kumar PAUL ajay Krishno SARKAR Department of Electrical & Electronic Engineering Rajshahi University of Engineering & Technology Rajshahi-6204 Bangladesh

A numerical analysis on dual core photonic crystal fiber (DC-PCF) based surface plasmon resonance (SPR) refractive index sensor is presented. The guiding parameters and required sensing performances are examined with finite element method (FEM) based software under MATLAB environment. According to simulation, it is warranted that the proposed refractive index sensor offers the maximum amplitude sensitivity of 554.9 refractive index unit (RIU-1) and 636.5 RIU 1 with the maximum wavelength sensitivity of 5800nm/RIU and 11 500nm/RIU, and the sensor resolutions of 1.72 ×10^-5RIU and 8.7× 10^-6 RIU, at analyte refractive index (RI) of 1.40 for x- and y-polarized modes, respectively. As the sensing performance in different wavelength ranges is quite high, the proposed sensor can be used in simultaneous detection for different wavelength ranges. Therefore, the proposed device is of a suitable platform for detecting biological, chemical, biochemical, and organic chemical analytes.

关键词： Photonic crystal fiber biosensor refractive index sensor finite element method plasmonic material